Sterilize the jar by submerging it in boiling water for 10 minutes. Add flavorings. Bring vinegar just to a boil and pour into jar. Cover jar with a piece of waxed or parchment paper to prevent lid corrosion. Screw on lid. Give the jar a good shake and set it in a cool, dark place for at least a few days and up to one week, shaking daily. Strain vinegar through a fine-mesh sieve. Return vinegar to the cleaned, re-sterilized jar or other decorative food-grade bottle.
Vinegar keeps in a cool, dark place for 3–4 months or refrigerate for 6–8 months.
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